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7 July, 11:45

The equation for the chemical reaction shown below is not balanced. What number should replace the question mark to balance this equation? 2Al + ? Cl2 → 2AlCl3 A. the number 2 B. the number 3 C. the number 4 D. the number 5

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  1. 7 July, 12:37
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    B. the number 3.

    there are 2Al's on both sides and 6 Cl's on the right side so to balance it, you multiply Cl2 by 3 to get 6 Cl's.
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